远程动态低温等离子体接枝制备抗菌亲水多孔膜
首发时间:2012-11-15
摘要:本研究采用远程动态低温等离子体活化-接枝方法,将水溶液中抗菌单体甲基丙烯酰氧乙基-苄基-二甲基氯化铵(DMAE-BC)接枝到聚丙烯纤维(PPF)多孔膜的纤维表面,制备了具有抗菌功能的亲水膜材料。通过FTIR、XPS和SEM分析了改性前后膜表面官能团、元素组成以及膜表面形貌的变化,结果表明DMAE-BC接枝聚合到了膜表面。以大肠杆菌为模拟体系,采用平板计数法和吸光度法分别考察了改性膜的杀菌和抑菌效果。结果表明,改性后的PPF膜具有很强的杀菌和抑菌作用,并且随接枝率的增大抗菌特性增强。另外,接枝膜在实现抗菌改性的同时亲水性和纯水通量也有明显改善,在0.02 MPa跨膜压差下,原膜检测不到水通量,而对于接枝率为4.04 mg/g的膜,膜表面接触角减小了近35 ,纯水通量达到4400 kg/(m2•h)。
关键词: 低温等离子体 PPF多孔膜 抗菌接枝 DMAE-BC 大肠杆菌
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Preparation of antibacterial and hydrophilic membranes by long-distance and dynamic low-temperature plasma flow
Abstract:Polypropylene fibrous (PPF) membranes were grafted with DMAE-BC by long-distance and dynamic low-temperature plasma (LDDLTP) flow in order to achieve antibacterial properties. The PPF membranes were first treated by Ar LDDLTP flow and then grafted with DMAE-BC in aqueous solutions. The function groups, element composition and morphology of the modified membranes were analysised by FTIR, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), respectively. Plate counting method and absorption photometry were used to evaluate the sterilization and bacteriostatic properties of the membranes against Gram-negative Escherichia coli, respectively. The results show that the membranes grafted with DMAE-BC were effective against E. coli. In addition, the hydrophilicity and pure water flux of the modified membranes have a significant improvement. When the grafting yield is 4.04 mg/g, the contact angle decrease 35 and the pure water flux gets to 4400 kg/(m2•h) at a transmembrane pressure of 0.02MPa.
Keywords: LDDLTP flow polypropylene fibrous membranes antibacterial grafting DMAE-BC Escherichia coli
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